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VOLUME 66 (1997) | ISSUE 4 | PAGE 263
Quantum dot multiexcitons in magnetic field
Multiexcitons confined in InGaAs/GaAs quantum dots (QD's) with a lateral size slightly exceeding the exciton Bohr radius have been investigated by magnetopho-toluminescence spectroscopy at 2 K. The Coulomb correlations in the two-exciton-complex result in an additional confinement, which increases with decreasing dot size, the magnetic field reduces this effect. A three exciton complex is confined only due to the geometric confinement potential of the QD. The exciton-exciton repulsion increases with decreasing dot size, the magnetic field reduces strongly the repulsion when the magnetic length becomes smaller than the lateral QD size. A shell model for the quantum dot multiexciton states has been suggested. PACS: 71.35.-y, 73.20.-r